package com.bo.collection;
//Collection
import java.util.ArrayList;
import java.util.Collection;
import java.util.Iterator;

public class Demo01  {
    public static void main(String[] args) {
        //创建一个集合
        Collection collection = new ArrayList();
        //添加元素
        collection.add("苹果");
        collection.add("西瓜");
        collection.add("榴莲");
        System.out.println("元素个数："+collection.size());
        System.out.println(collection);
        //删除元素
        collection.remove("苹果");
        System.out.println("删除后元素个数："+collection.size());
        //清空元素
        //collection.clear();
        //System.out.println("清空元素后个数："+collection.size());

        //遍历元素
        System.out.println("---------------增强for----------");
        for (Object object:collection) {
            System.out.println(object);
        }
        System.out.println("------------迭代器(专门用来遍历集合)--------------");
        Iterator it=collection.iterator();
        while(it.hasNext()){
            String s =(String) it.next();
            System.out.println(s);
            //不能使用collection.remove()删除方法
            //it.remove();//删除用it.remove
        }
        System.out.println("删除之后:"+collection.size());
        //判断
        System.out.println(collection.contains("西瓜"));//有没有西瓜
        System.out.println(collection.isEmpty());//是不是空的


    }
}